Performed heating maintenance on attic 90% Carrier gas furnace. Checked amperages of indoor ECM blower motor and inducer draft motor. Checked capacitor for inducer. Cleaned flame sensor and pressure switch tubing. Ensured a proper flame while heating and a proper ignition startup. Checked mechanics operations. Verified voltage. Tested system with thermostat and checked air flow and temperature split. Changed indoor air filter. System is heating and operational at this time.